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The term "plenum" was coined in the 1670s, derived from Latin adjective plenus ("filled, full"). The usage originates from classical theories of physics and the notion that "nature abhors a vacuum". These gave rise to the notion of 17th century 'plenum' as the opposite of vacuum, and all things "being either Plenum or Vacuum". [2]
Air streams are mixed to save energy and improve energy efficiency by partially recirculating conditioned air.. The most common application for an air-mixing plenum is the mixing of return air (or extract air) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. [1]
Plenum may refer to: Plenum chamber, a chamber intended to contain air, gas, or liquid at positive pressure; Plenism, or Horror vacui the concept that "nature abhors a vacuum" Plenum (meeting), a meeting of a deliberative assembly in which all members are present; contrast with quorum; Plenum space, enclosed spaces (in buildings) used for airflow
A plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned or return airflows, usually at greater than atmospheric pressure.
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Description: Example of a typical commercial building with the space above the drop-ceiling acting as an air-return plenum. If a fire were to start above the drop ceiling, toxic fumes would be drawn into the open-air system and potentially poison building occupants before they are aware of the fire.
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